How to Clean Solar Panels: Simple Steps for Effective Maintenance

This guide will provide simple and effective steps on how to clean solar panels to ensure optimal performance.

Key takeaways:

  • Dust, pollen, and bird droppings reduce solar panel efficiency.
  • Prioritize safety and gather necessary tools before cleaning.
  • Spray, scrub, rinse, and dry panels using gentle techniques.
  • Restart and monitor the system to ensure effective cleaning.
  • Cleaning should be done at least once or twice a year.

Why Do Solar Panels Need Cleaning?

how to clean solar panels simple steps for effective maintenance

Dust, pollen, leaves, and bird droppings can accumulate on solar panel surfaces, impeding sunlight absorption and reducing energy efficiency. Regular cleaning maintains optimal performance.

Additionally, unwashed panels may suffer from hot spots due to accumulated grime, potentially leading to damage over time. Clean panels ensure maximum output and prolong the system’s lifespan, safeguarding your investment.

Safety Considerations and Gather Tools

Before undertaking the task of cleaning solar panels, prioritize safety to prevent accidents. If panels are on the roof, use a sturdy ladder and harness or consider hiring professionals. For ground-mounted panels, ensure stability on even ground.

Assemble necessary tools:

  • Soft brush or sponge to loosen dirt without scratching surfaces
  • Squeegee with a plastic blade to remove water and avoid mineral deposits
  • Hose with a nozzle for gentle rinsing; a pressure washer is not recommended
  • Bucket with soapy water; use mild, biodegradable soap to protect your lawn and the environment
  • Protective gloves and non-slip shoes for personal safety

Always turn off the solar panel system before cleaning to avoid electrical hazards. Check manufacturer guidelines for any specific cleaning instructions related to your solar panels.

Cleaning Process: Spray, Scrub, Rinse and Dry

Begin the cleaning process by gently spraying the panels with water to remove loose dirt and debris. If the panels are dry, pre-soaking them helps soften grime, making it easier to clean without damaging the surface.

After spraying, use a soft brush or a non-abrasive sponge to gently scrub the panels in a circular motion. It’s important to do this carefully to avoid scratching the glass. For tough spots, a mild, soapy water solution can be effective—just make sure the soap is free from harsh chemicals which could damage the panels.

Once the panels are scrubbed clean, rinse them thoroughly with water to remove any soap residue. It’s crucial that no soap or suds remain as these can leave a film on the panels that may reduce their efficiency.

Allow the panels to air dry or use a squeegee for a streak-free finish. Be sure the panels are completely dry before restarting the system to prevent any water spots from forming.

Restart and Monitor the Solar Panel System

Once the solar panels are clean and dry, it’s time to get them back into operation. Carefully reconnect any wiring disconnected during the cleaning process. Switch the system back on, adhering to the manufacturer’s or installer’s recommended procedures.

After restarting, it’s essential to monitor the system’s output. Check the energy production data through the inverter display or monitoring software. An increase in power output is a good indicator that the cleaning was effective.

Keep an eye on the production over the coming days to ensure there are no sudden drops in efficiency, which might signal an issue that needs professional attention. Regular monitoring allows you to gauge the optimal frequency for future cleanings and maintain peak performance.


What is the best thing to clean solar panels with?

The best thing to clean solar panels with is either an outdoor glass cleaner that is free of harmful chemicals, a cleaner specifically made for solar panels, or a homemade cleaning solution consisting of a combination of dish soap and water or one part vinegar to eight parts water.

Can I use Dawn dish soap to clean my solar panels?

Yes, you can use Dawn dish soap to clean your solar panels, it is suggested to dilute it with warm water and apply it with a soft sponge or cloth to prevent any scratches or damages to the glass.

How do professionals clean solar panels?

Professionals clean solar panels by using deionized water and a rolling or vehicle-mounted brush, a method that avoids the use of soap and its residue that can shade panels and attract dirt.

Do you need to turn off solar panels before cleaning?

Before cleaning, it is essential to shut off the solar panels to ensure personal safety.

What frequency is recommended for cleaning solar panels?

Solar panels should typically be cleaned at least once or twice a year to maintain optimal performance.

Are there specific weather conditions ideal for solar panel cleaning?

Yes, the ideal weather conditions for solar panel cleaning are early morning or late evening during calm, overcast days to prevent rapid evaporation and streaking.

Is it necessary to hire professionals for solar panel maintenance, or can it be a DIY task?

Although some basic maintenance like cleaning and inspection can be done by homeowners, it is recommended to hire professionals for tasks that require specialized knowledge such as system checks and electrical maintenance.

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